Douglas T Dietrich

CIK 1408736 · View on SEC EDGAR ↗

Insider

First SEC filing: Aug. 7, 2007 · Latest: May 18, 2026

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Insider transactions

0 buys (P) 1 sells (S) Net: $-1,758,439 + 95 non-open-market transactions below last 12 months, based on the transactions shown below

Price change vs current quote, split-adjusted for corporate actions since the filing — not benchmarked, not annualized, not size-weighted

95 other filings hidden
Date Ticker Code Shares Price Value Owned after Δ own A/D vs now
May 14, 2026 MTX S 21,568 $81.53 $1,758,439 175,973 Direct -10.92% Disposed -11.9% (price as of 2026-08-21)
April 30, 2025 MTX P 2,000 $51.56 $103,120 161,675 Direct +1.25% Acquired 39.3% (price as of 2026-08-21)
Jan. 26, 2012 MTX P 0 — — 834 Indirect 0.00% Acquired (price as of 2026-08-21)
Jan. 26, 2012 MTX P 0 — — 834 Indirect 0.00% Acquired (price as of 2026-08-21)
Jan. 26, 2012 MTX P 0 — — 834 Indirect 0.00% Acquired (price as of 2026-08-21)

Showing latest 100 of 112 transactions

P = Open-market purchase · S = Sale · A = Grant/award · M = Option exercise · G = Gift · F = Tax withholding

Insider transactions are not a recommendation; sales are often driven by liquidity or tax reasons.

Derivative holdings (Form 4 Table II)

Options, RSUs and convertible securities reported on Form 4 Table II.

Date Ticker Security Underlying Exercise price Expiration Shares A/D
Aug. 15, 2026 KMT Stock Credits Common Stock (4,965) — — 4,965 Acquired
May 26, 2026 KMT Stock Credits Common Stock (697) — — 697 Acquired
May 14, 2026 MTX Employee Stock Options (Right to Buy) Common Stock (21,568) $78.03 Jan. 17, 2027 21,568 Disposed
Feb. 24, 2026 KMT Stock Credits Common Stock (642) — — 642 Acquired
Jan. 30, 2026 KMT Restricted Stock Units Common Stock (841) — — 841 Disposed
Jan. 26, 2026 MTX Deferred Restricted Stock Units (DRSUs) Common Stock (11,123) — — 11,123 Disposed
Jan. 23, 2026 MTX Deferred Restricted Stock Units (DRSUs) Common Stock (11,016) — — 11,016 Disposed
Jan. 21, 2026 MTX Deferred Restricted Stock Units (DRSUs) Common Stock (10,033) — — 10,033 Disposed
Jan. 20, 2026 MTX Employee Stock Option (Right to Buy) Common Stock (33,494) $66.23 Jan. 20, 2036 33,494 Acquired
Jan. 20, 2026 MTX Deferred Restricted Stock Units (DRSUs) Common Stock (39,000) — — 39,000 Acquired
Nov. 24, 2025 KMT Stock Credits Common Stock (893) — — 893 Acquired
Aug. 26, 2025 KMT Stock Credits Common Stock (991) — — 991 Acquired
Aug. 15, 2025 KMT Stock Credits Common Stock (6,898) — — 6,898 Acquired
May 27, 2025 KMT Stock Credits Common Stock (977) — — 977 Acquired
Feb. 25, 2025 KMT Stock Credits Common Stock (635) — — 635 Acquired
Feb. 1, 2025 KMT Restricted Stock Units Common Stock (2,523) — — 2,523 Acquired
Jan. 25, 2015 MTX Deferred Restricted Stock Units (DRSU) Common Stock (3,746) — — 3,746 Disposed
Jan. 22, 2015 MTX Deferred Restricted Stock Units (DRSU) Common Stock (2,450) — — 2,450 Disposed
Jan. 22, 2015 MTX Deferred Restricted Stock Units (DRSU) Common Stock (3,278) — — 3,278 Disposed
Jan. 20, 2015 MTX Deferred Restricted Stock Units (DRSUs) Common Stock (22,929) — — 22,929 Acquired
Jan. 20, 2015 MTX Employee Stock Option (Right to Buy) Common Stock (14,020) $60.18 Jan. 20, 2025 14,020 Acquired
Jan. 27, 2014 MTX Deferred Restricted Stock Units (DRSUs) Common Stock (3,102) — — 3,102 Disposed
Jan. 27, 2014 MTX Deferred Restricted Stock Units (DRSUs) Common Stock (3,746) — — 3,746 Disposed
Jan. 22, 2014 MTX Deferred Restricted Stock Units ("DRSUs") Common Stock (7,349) — — 7,349 Acquired
Jan. 22, 2014 MTX Employee Stock Option (Right to Buy) Common Stock (13,936) $57.96 Jan. 22, 2024 13,936 Acquired
Jan. 22, 2014 MTX Deferred Restricted Stock Units (DRSUs) Common Stock (3,278) — — 3,278 Disposed
Aug. 7, 2013 MTX Employee Stock Option (Right to Buy) Common Stock (17,000) $19.86 Jan. 28, 2019 17,000 Disposed
Jan. 28, 2013 MTX Deferred Restricted Stock Units (DRSUs) Common Stock (3,104) — — 3,104 Disposed
Jan. 28, 2013 MTX DRSUs Common Stock (2,640) — — 2,640 Disposed
Jan. 25, 2013 MTX Deferred Restricted Stock Units (DRSUs) Common Stock (3,748) — — 3,748 Disposed
Jan. 22, 2013 MTX Deferred Restricted Stock Units (DRSUs) Common Stock (9,833) — — 9,833 Acquired
Jan. 22, 2013 MTX Employee Stock Option (Right to Buy) Common Stock (18,558) $41.29 Jan. 22, 2013 18,558 Acquired
Jan. 28, 2012 MTX Deferred Restricted Stock Units (DRSUs) Common Stock (1,633) — — 1,633 Disposed
Jan. 27, 2012 MTX Deferred Restricted Stock Units (DRSUs) Common Stock (1,320) — — 1,320 Disposed
Jan. 26, 2012 MTX Deferred Restricted Stock Units (DRSUs) Common Stock (1,552) — Jan. 26, 2021 1,552 Disposed
Jan. 25, 2012 MTX Deferred Restricted Stock Units (DRSU) Common Stock (5,620) — — 5,620 Acquired
Jan. 25, 2012 MTX Employee Stock Option (Right to Buy) Common Stock (9,128) $64.06 Jan. 25, 2022 9,128 Acquired
Feb. 27, 2011 MTX Deferred Restricted Stock Units (DRSUs) Common Stock (933) — — 933 Disposed
Jan. 28, 2011 MTX Deferred Restricted Stock Units (DRSUs) Common Stock (1,633) — — 1,633 Disposed
Jan. 27, 2011 MTX Deferred Restricted Stock Units (DRSUs) Common Stock (1,320) — — 1,320 Disposed
Jan. 26, 2011 MTX Deferred Restricted Stock Units (DRSUs) Common Stock (4,655) — — 4,655 Acquired
Jan. 26, 2011 MTX Employee Stock Option (Right to Buy) Common Stock (7,447) $64.46 Jan. 26, 2021 7,447 Acquired
Aug. 2, 2010 MTX Deferred Restricted Stock Units (DRSUs) Common Stock (350) — — 350 Disposed
March 1, 2010 MTX Deferred Restricted Stock Units (DRSUs) Common Stock (933) — — 933 Disposed
Jan. 28, 2010 MTX DRSUs Common Stock (1,634) — — 1,634 Disposed
Jan. 27, 2010 MTX Employee Stock Option (Right to Buy) Common Stock (6,870) $49.12 Jan. 27, 2010 6,870 Acquired
Jan. 27, 2010 MTX Deferred Restricted Stock Units (DRSUs) Common Stock (3,960) — — 3,960 Acquired
Aug. 3, 2009 MTX Deferred Restricted Stock Units ("DRSUs") Common Stock (350) — — 350 Disposed
Feb. 27, 2009 MTX Deferred Restricted Stock Units ("DRSUs") Common Stock (934) — — 934 Disposed
Jan. 28, 2009 MTX Deferred Restricted Stock Units (DRSUs) Common Stock (4,900) — — 4,900 Acquired
Jan. 28, 2009 MTX Employee Stock Option (Right to Buy) Common Stock (8,500) $39.71 Jan. 28, 2019 8,500 Acquired
Aug. 1, 2008 MTX Deferred Restricted Stock Units ("DRSUs") Common Stock (350) — — 350 Disposed
Feb. 27, 2008 MTX Deferred Restricted Stock Units ("DRSUs") Common Stock (2,800) — — 2,800 Acquired
Feb. 27, 2008 MTX Employee Stock Option (Right to Buy) Common Stock (5,000) $64.16 Feb. 27, 2018 5,000 Acquired

Exercise/conversion price is blank when not applicable (e.g. RSUs).

Initial ownership (Form 3) 3 holdings

Securities held when first becoming an insider, per SEC Form 3.

Date Ticker Security Shares Ownership
Aug. 7, 2007 MTX COMMON STOCK 0 Direct
Aug. 7, 2007 MTX Employee Stock Option (Right to Buy)→ Common Stock (2,100) 2,100 Direct
Aug. 7, 2007 MTX Deferred Restricted Stock Units ("DRSUs")→ Common Stock (1,050) 1,050 Direct

Compensation (DEF 14A)

Matched by name from proxy statements (DEF 14A) — verify against the filing.

MTX

CEO
Fiscal year Salary Bonus Stock awards Option awards Non-equity incentive Pension change Other Total
2023 $1,046,154 — $2,204,989 $1,439,445 $3,195,682 $413,206 $55,776 $8,355,252
2022 $1,000,000 — $1,999,987 $1,193,782 $2,826,907 $366,896 $51,904 $7,439,476
2021 $1,000,000 — $1,920,006 $959,997 $3,108,861 $47,892 $49,140 $7,085,896

Figures from the Summary Compensation Table of the company's proxy statement (DEF 14A). Compensation is not a recommendation.